RU84478U1 - Borehole plunger pumping unit - Google Patents

Abstract

A downhole plunger pump installation, including a plunger pump installed in the well with suction and discharge valves and with rods connected to the plunger, lift pipes connected to the pump cylinder, wellhead seal located at the wellhead, and a downhole pump drive, characterized in that the rods located at the bottom of the plunger and equipped with an anchor unit made with the possibility of fixing relative to the walls of the well, and the lift pipes are connected to the drive and are made with the possibility of reciprocating of displacement, wherein the compression seal fitting is adapted to seal the tubing which is further equipped with a device above the packing spout, with their reciprocal movement.

Description

The proposal relates to the oil and gas industry, namely, devices for lifting well fluid to the surface.

The well-known "Deep well pumping installation" (patent RU No. 2118708, F04B 47/02, publ. 09/10/1998), containing a plunger pump, ground drive with at least one drum and traction unit in the form of a tape package, compensator for tape lengths package installed between the plunger and the pump drive, characterized in that the compensator contains at least one gear wheel, the teeth of which are engaged with two racks located on both sides of it and installed in the housing, with at least one of the rails made movable in along the longitudinal axis, with the outer tapes of the turns connected to the movable rail, the axis of the gear to the plunger of the pump, and the inner tapes with one movable rail connected to the body, and with two movable rails - with the second movable rail.

Also known is a “Borehole sucker rod pumping unit” (patent PM RU No. 57388, F04B 47/00, published on 10/10/2006 in Bull. No. 28), containing a sucker rod pump installed in the well with a plunger or piston stroke up to 12 m, with this polished rod of the installation is removed through the gland from the well and connected via a rope to the mast drive, characterized in that the mast drive is made in the form of a vehicle mounted on the chassis of a vehicle, for example, a crane with a boom height of not less than the maximum stroke of the piston rod pump, to As a sucker rod pump, an NSB type cylindrical sucker rod pump or an NN-2SP piston sucker rod pump, the maximum tensile strength of the pump rods at maximum load of not more than 0.12 of the stroke length of the plunger and the extension of the tubing no more than 0.04 of the stroke length of the plunger are used .

Closest to the proposed one is the "Well pumping unit" (patent RU No. 2314434, F04B 47/02, published on January 10, 2006 Bull. No. 1), containing a sucker rod pump installed in the well, tubing and wellhead seal, characterized the fact that it is equipped with an antiphase device made in the form of a cylinder connected to the lower part of the wellhead stuffing box located in the cavity of the tubing and installed in it a piston connected with a rod string and cable suspension, while the piston has a length that provides tinuous tight interface with the cylinder and in the event of breakage, the cylinder and piston diameters antiphase devices are made equal diameters housing and plunger sucker rod pump to ensure equal volumes of displaced fluid at operating installation ducts.

The disadvantages of all analogues are the high cost, low functionality due to strict restrictions on the minimum diameter of the pump and its valves (and, consequently, on the diameter of the well), the curvature of the well, the viscosity of the production of the well and sand formation of the formation due to the need for pipes inside the column along their entire length of the rods for transferring reciprocating movement from the drive to the plunger, which also affects the release of paraffins and the increase in the associated loads on the drive and, as a consequence, the reduction of the coefficient efficiency factor (COP) of the entire pumping unit.

The technical task of the proposed utility model is the creation of an economical, efficient pumping unit with enhanced functionality due to the rejection of rods located along the entire length of the pipe string.

The technical problem is solved by a borehole plunger pump installation, including a plunger pump installed in the well with suction and discharge valves and with rods connected to the plunger, elevator pipes connected to the pump cylinder, wellhead stuffing box located at the wellhead, and a well pump drive.

What is new is that the rods are located at the bottom of the plunger and are equipped with an anchor unit that can be fixed relative to the walls of the well, and the lift pipes are connected to the drive and are made with the possibility of reciprocating movement, and the stuffing box is made with the possibility of sealing the lift pipes, which are additionally equipped above the stuffing box drain port, when they are reciprocating.

The drawing shows a diagram of a pumping unit in longitudinal section.

The downhole plunger pump installation includes a plunger pump 2 installed in the well 1 with suction 3 and discharge 4 valves and with rods 5 connected to the plunger 6, lift pipes 7 connected to the cylinder 8 of the pump 2, wellhead stuffing box 9, located at the wellhead 1, and a well pump drive (not shown in FIG.). The rods 5 are located at the bottom of the plunger 6 and are equipped with an anchor assembly 10 that is capable of fixing relative to the walls of the well 1. The elevator pipes 7 are connected to the drive (not shown in FIG.) By a link 11 and are arranged for reciprocating movement. The stuffing box 9 is made with the possibility of sealing the lift pipes 7, which are additionally equipped with a drain pipe 12 above the stuffing box 9, at the wellhead 1 during their reciprocating movement.

The anchor assembly 10 can be used hydraulic or mechanical of any known design. The hydraulic anchor assembly 10 is pre-installed by lowering the pressure on the pipe string to the required interval until it is fixed with rams 13 relative to the walls of the well 1, and then lower

Downhole plunger pumping unit operates as follows.

The anchor assembly 10 can be used hydraulic or mechanical of any known design.

The hydraulic anchor assembly 10 is installed, first lowering on the pipe string to the required interval, by pressure until it is fixed with dies 13 relative to the walls of the well 1. After that, the pipe string is removed and the plunger pump 2 connected from below (for example, sleeve 14) is lowered through the stuffing box 9 until the rods 5 are fixed in the anchor assembly 10 (for example, by means of a spring ring or spring-loaded clips - not shown in Fig.).

The mechanical anchor assembly 10 is fixed on the rods 5 on the surface and lowered on the lift string to the required interval of the well 1 together with the plunger pump 2. Then its rams 13 are fixed relative to the walls of the well 1 by turning from the mouth (for which the plunger 6 is fixed with shear elements relative to the cylinder 8 - not shown) or by pulling the elevator column 7 up.

During the descent, the borehole fluid through the valves 3 and 4 fills the plunger 6, the cylinder 8 of the pump 2 and the lift column 7.

Then, opposite the stuffing box device 9, a section of the lift column 7 with a polished surface 15 is placed to reduce friction and quickly damage the stuffing box 9. The packing rings 16 are inserted into the stuffing box 9, which are pressed for better sealing of the lift string 7 by the stop 17. Above the stuffing box 9 a pipe 12 is hermetically connected to the elevator column 7, which is connected to the pipeline (not shown) by a movable connection or a flexible hose (not shown in the drawing) to divert the well dots. The elevator column 7 is connected to the drive by a link 11 from above (for example, a rocking machine, a chain drive or a hydraulic drive).

Moreover, to prevent the plunger 6 from falling out during descent from the cylinder 8, it is equipped with a stop 18 from the bottom. After that, the drive is put into operation, and it transfers the reciprocating movement to the lift column 7 and cylinder 8 of the pump 2 through the rod 11. Since the rod 5 and plunger 6 fixed anchor node 10 relative to the walls of the well 1, they remain stationary. When the lift column 7 moves down, the suction valve 3 closes, the well fluid located in the cylinder 8 is squeezed out through the discharge valve 4 into the lift column 7. When the lift column 7 moves down, the discharge valve 4 closes under the action of the liquid column 7, and the suction valve 3 under the action of the discharge that occurs in the cylinder 8, the well fluid opens through the cavity 19 of the rod 5 (if it is hollow) or the side channels 20 of the plunger 6 receives the cylinder 8. Then the cycles are repeated, and as a result, the well the density rises along the lift column 7 to the surface of the well 1, from where it is pumped through the pipe 12 through the pipeline.

Since the proposed plunger pump installation in the elevator string does not have rods (which reduces the cost of the design as a whole) that impede fluid flow, the amount of paraffin deposits on the cylinder, plunger, valves and elevator string is reduced by 3-6 times during the production of viscous oil, and loads on the drive, while they can be used for elevator pipes of smaller diameter tubes (which also reduces the cost of the design), then with an average flow rate of the well fluid exceeding the rate of deposition of solid inclusions (for example, sand ), It is excluded deposits in the cylinder of the rain. All this together increases the efficiency of the installation, expands the functionality, allowing the use of this installation in complicated by a large curvature of the wellbore, for the production of highly viscous oils and from reservoirs with high sand manifestations, as well as in wells with parallel pipes due to the smallest possible installation dimensions.

Claims (1)

A downhole plunger pump installation, including a plunger pump installed in the well with suction and discharge valves and with rods connected to the plunger, lift pipes connected to the pump cylinder, wellhead seal located at the wellhead, and a downhole pump drive, characterized in that the rods located at the bottom of the plunger and equipped with an anchor unit made with the possibility of fixing relative to the walls of the well, and the lift pipes are connected to the drive and are made with the possibility of reciprocating of displacement, wherein the compression seal fitting is adapted to seal the tubing which is further equipped with a device above the packing spout, with their reciprocal movement.